我们如何模拟返回多个表达式的 mysql intersect 查询?

因为咱们无奈正在MySQL外利用INTERSECT盘问,因而咱们将利用EXIST运算符来依然INTERSECT查问。否以经由过程下列事例来明白 -

事例

正在此事例外,咱们有二个表,即 Student_detail 以及 Student_info,存在下列数据 -

mysql> Select * from Student_detail;
+-----------+---------+------------+------------+
| studentid | Name    | Address    | Subject    |
+-----------+---------+------------+------------+
|       101 | YashPal | Amritsar   | History    |
|       105 | Gaurav  | Chandigarh | Literature |
|       130 | Ram     | Jhansi     | Computers  |
|       13两 | Shyam   | Chandigarh | Economics  |
|       133 | Mohan   | Delhi      | Computers  |
|       150 | Rajesh  | Jaipur     | Yoga       |
|       160 | Pradeep | Kochi      | Hindi      |
+-----------+---------+------------+------------+
7 rows in set (0.00 sec)

mysql> Select * from Student_info;
+-----------+-----------+------------+-------------+
| studentid | Name      | Address    | Subject     |
+-----------+-----------+------------+-------------+
|       101 | YashPal   | Amritsar   | History     |
|       105 | Gaurav    | Chandigarh | Literature  |
|       130 | Ram       | Jhansi     | Computers   |
|       13二 | Shyam     | Chandigarh | Economics   |
|       133 | Mohan     | Delhi      | Computers   |
|       165 | Abhimanyu | Calcutta   | Electronics |
+-----------+-----------+------------+-------------+
6 rows in set (0.00 sec)
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而今,应用带有 WHERE 子句的 EXIST 运算符的下列盘问将还是 INTERSECT 以返归二个表外皆具有的“studentid”、姓名、地点(个中名称没有是“Yashpal”) -

mysql>Select Student_detail.studentid,Student_detail.name, student_detail.address FROM student_detail WHERE Student_detail.studentid >100 AND EXISTS (SELECT * FROM Student_info WHERE Student_info.Name <> &#39;Yashpal&#39; AND Student_info.studentid = Student_detail.studentid AND Student_info.name = Student_detail.name);
+-----------+--------+------------+
| studentid | name   | address    |
+-----------+--------+------------+
|       105 | Gaurav | Chandigarh |
|       130 | Ram    | Jhansi     |
|       13二 | Shyam  | Chandigarh |
|       133 | Mohan  | Delhi      |
+-----------+--------+------------+
4 rows in set (0.00 sec)
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以上便是咱们若何依然返归多个表明式的 MySQL INTERSECT 盘问?的具体形式,更多请存眷萤水红IT仄台此外相闭文章!

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